This is the newest of the city parks. It was established in 1943 when Richard King Mellon donated the family mansion and surrounding grounds to the City of Pittsburgh. Maintenance of the park was turned over to the city at that time. While the mansion itself has been torn down, it is still possible to see some artifacts such as gates and fences within the park area.

The park was expanded through the addition of adjacent properties, including the house and gardens of the Marshall estate (now the Center for the Arts Building), the Scaife estate (now the Civic Education Center), the Frew estate, and the Darcy house. The latter two have since been torn down.

Today, the park covers approximately 35 acres, bounded by Fifth and Shady Avenues and Beechwood Boulevard. While relatively small, it provides a fine recreational and relaxing green space in a compact urban setting.